#include <cstdio>
#include <algorithm>
#include <iostream>
#include<cstring>
#include<cmath>
using namespace std;
const int maxn=10005;
bool cmp(int a,int b)
{
	return a>b;
}
int main()
{
	int a,b,ta,tb,h,m,T,t,sum,x,y,i;
	scanf("%d",&T);
	while(T--)
	{
		sum=0;
		scanf("%d%d%d%d",&a,&ta,&b,&tb);
		getchar();
		scanf("%d:%d",&h,&m);
		t=60*h+m;
		for(i=300;i<1440;i+=b)
		{
			if(i>t-tb&&i<t+ta)
				sum++;
		}
		printf("%d\n",sum);
	}
}